Sleep, Growth Hormone, and Autophagy: How Rest, Diet, and Fasting Support Metabolic Health and Longevity: Nutritionist Leyla Muedin discusses how deep, early non-REM sleep boosts growth hormone for muscle, bone, fat burning, and metabolic health, and reviews a Cell study in which UC Berkeley researchers mapped hypothalamic circuits and feedback through the locus coeruleus showing a tight balance between sleep, growth hormone release, and wakefulness, with implications for metabolic disease and neurodegeneration. She connects poor sleep to higher blood sugar, insulin, and cortisol, which can suppress growth hormone, and advises avoiding sweet post-workout foods (e.g., smoothies, bananas, fruit yogurt) that stimulate insulin and blunt growth hormone, recommending protein and fat instead. She then explains autophagy and mitophagy as cellular cleanup processes linked to longevity, noting autophagy peaks after 12 hours of fasting, highlighting roles in mitochondrial quality control, immunity, and neurodegenerative disease, and mentions interventions such as fasting, exercise, ketogenic diets, and investigational inducers like rapamycin and urolithin A.